java生成饼图svg

package com.tellhow.svg;

import java.io.File;
import java.io.FileOutputStream;

/**
*
* @author 风絮NO.1
*
*/
public class CakySvgWithLabel {
//定义不同的颜色
static String[] colors ={"#f2e692", "#aa1111",
"#799AE1", "#3e941b",
"#66cc00", "#297110",
"#d6a97b", "#82522b",
"#aaaaff", "#1111aa",
"#ff2222", "#ffaaaa"};

static String initialize(double [] percents,String[]names){
StringBuffer sfile = new StringBuffer();
sfile.append("<?xml version='1.0' encoding='UTF-8'?>");
sfile.append("\n");
sfile.append("<svg xmlns:svg='http://www.w3.org/2000/svg'");
sfile.append("\n");
sfile.append("xmlns='http://www.w3.org/2000/svg'");
sfile.append("\n");
sfile.append("xmlns:xlink='http://www.w3.org/1999/xlink'");
sfile.append("\n");
sfile.append("xml:space='default'");
sfile.append("\n");
sfile.append("version='1.1' width='100%' height='100%' viewBox='0 0 2024 570'>");
sfile.append("\n");
sfile.append("<defs></defs>");
sfile.append("\n");
sfile.append("<g stroke-width='1' stroke='#FFFFFF' transform='matrix(1,0,0,1,16.384,-9.83)' xmlns='http://www.w3.org/2000/svg'>");
sfile.append("\n");
//循环创造path标签.
String path =creatPath(502, 300, 300, percents,names);//中心点式503,300.
sfile.append(path);
sfile.append("</g>");
sfile.append("\n");
sfile.append("</svg>");
return sfile.toString();
}
/**
*
* @param x0 中心点横坐标
* @param y0 中心点纵坐标
* @param r 半径
* @param percents 百分比数组
* @param names 显示颜色代表的名称
* @return
*/
public static String creatPath(double x0,double y0,double r,double[]percents,String[]names){
StringBuffer sfile =new StringBuffer();
double x1=0; //新扇形的x坐标
double y1=0; //新扇形的y坐标
double middleX=0; //文本显示的坐标,包括竖线显示的坐标
double middleY=0;
double radian =0; //弧度
double textRadian=0; //文本显示位置度弧度
double k=0;
int N=10;
for(int i=0;i<percents.length;i++){

if(i==0){
radian =getRadian(percents[0]);
textRadian=radian/2;
x1 = (x0+getCos(radian)*r);
y1 = (y0-getSin(radian)*r);
middleX=(x0+getCos(textRadian)*r);
middleY=(y0-getSin(textRadian)*r);
double percent = Math.round(percents[0]*100)/100.0;//获得精确到两位小数点的坐标.
k=Math.abs((middleY-y0)/(middleX-x0));//获得扇形终点的坐标,与中心点连成的直线的斜率.(取正值)
double sita= Math.atan(k);//求斜角
double lineLen=50;
double textLen=70;
if(radian<6){
lineLen=90;
textLen=110;//控制指示线的长度,与文字的位置
}
if(percents[i]!=0){//当一个类型为0时，饼图展示
if((textRadian<(Math.PI/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI/2)&&textRadian<Math.PI)){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI)&&textRadian<(Math.PI*3/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY+(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if((textRadian>(Math.PI*3/2)&&textRadian<(Math.PI*2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY+Math.sin(sita)*lineLen)+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}
sfile.append("\n");
if(getRadian(percents[0])>Math.PI){
sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+r)+" "+r+" A "+r+" "+r+" 0 1 0 "+x1+" "+y1+" L "+x0+" "+y0+" z' fill='"+colors[0]+"'/>");
}else{
sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+r)+" "+r+" A "+r+" "+r+" 0 0 0 "+x1+" "+y1+" L "+x0+" "+y0+" z' fill='"+colors[0]+"'/>");
}
sfile.append("\n");
}

sfile.append("<rect x='"+(x0+2*r)+"' y='"+(y0-r/2.0+N)+"' width='60' height='30' fill='"+colors[i]+"' stroke='#FFFFFF' stroke-dasharray='1,1' />");
sfile.append("\n");
sfile.append("<text x='"+(x0+2*r+80)+"' y='"+(y0-r/2.0+N+25)+"' space='preserve' font-family='宋体' font-size='28' fill='"+colors[0]+"' stroke='#000000' stroke-dasharray='1,1' baseline-shift='baseline'>"+names[0]+"</text>");
sfile.append("\n");

}else{
textRadian = radian+(getRadian(percents[i])/2);//获取指示线与X轴的弧度.
radian =radian+getRadian(percents[i]);//第i个扇形前面的弧度的总和
middleX=(x0+getCos(textRadian)*r);
middleY=(y0-getSin(textRadian)*r);
double percent = Math.round(percents[i]*100)/100.0;
k=Math.abs((middleY-y0)/(middleX-x0));
double lineLen=50;
double textLen=70;
if(radian<6){
lineLen=90;
textLen=110;
}
double sita= Math.atan(k);
if(percents[i]!=0){//当一个类型为0时，饼图展示
if((textRadian<(Math.PI/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI/2)&&textRadian<Math.PI)){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI)&&textRadian<(Math.PI*3/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY+(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if((textRadian>(Math.PI*3/2)&&textRadian<(Math.PI*2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY+Math.sin(sita)*lineLen)+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}
sfile.append("\n");
// 参数 1 表示 画大于180的弧, 0 表示画小于180的弧 (这个地方比较重要)
if(getRadian(percents[i])>Math.PI){
sfile.append("<path d='M "+x0+" "+y0+" L "+x1+" "+y1+" A "+r+" "+r+" 0 1 0 "+(x1=x0+getCos(radian)*r)+" "+(y1=y0-getSin(radian)*r)+" L "+x0+" "+y0+" z' fill='"+colors[i]+"'/>");
}else{
sfile.append("<path d='M "+x0+" "+y0+" L "+x1+" "+y1+" A "+r+" "+r+" 0 0 0 "+(x1=x0+getCos(radian)*r)+" "+(y1=y0-getSin(radian)*r)+" L "+x0+" "+y0+" z' fill='"+colors[i]+"'/>");
}
sfile.append("\n");
}
N+=50;
sfile.append("<rect x='"+(x0+2*r)+"' y='"+(y0-r/2.0+N)+"' width='60' height='30' fill='"+colors[i]+"' stroke='#FFFFFF' stroke-dasharray='1,1' />");
sfile.append("\n");
sfile.append("<text x='"+(x0+2*r+80)+"' y='"+(y0-r/2.0+N+25)+"' space='preserve' font-family='宋体' font-size='28' fill='"+colors[0]+"' stroke='#000000' stroke-dasharray='1,1' baseline-shift='baseline'>"+names[i]+"</text>");
sfile.append("\n");
}

}
return sfile.toString();
}
//返回弧度
public static double getRadian(double fenshu){
return (fenshu*Math.PI)/50;
}
//返回正弦
public static double getSin(double radian){
return Math.sin(radian);
}
//返回余弦
public static double getCos(double radian){
return Math.cos(radian);
}
public static void main(String[] args) {
int[] data= {3,64,0,284,10};
String[] names={"主变:"+data[0]+"个","断路器:"+data[1]+"个","线路:"+data[2]+"个","刀闸:"+data[3]+"个","母线:"+data[4]+"个"};
create(data,names);
}

private static void create(int[] data,String[] names) {
try {
createSVG("d:/a.svg",getPercent(data),names);
} catch (Exception e) {
e.printStackTrace();
}
}
private static double[] getPercent(int data[]){
double sum=0;
double percents[] = new double[data.length];
for(int i=0;i<data.length;i++){
sum+=data[i];
}
for(int i=0;i<data.length;i++){
percents[i] =(data[i]/sum)*100;
}
return percents;
}

public static void createSVG(String fileRealPath, double[] percents,String[] names) throws Exception {
String sFile = initialize(percents,names);
try {
byte[] byteFil = sFile.getBytes("UTF-8");
File svgFile = new File(fileRealPath);
if (svgFile.exists()) {
svgFile.delete();
}
FileOutputStream fos = new FileOutputStream(svgFile);
fos.write(byteFil);
fos.close();
} catch (Exception ex) {
System.out.print(ex.getMessage());
}
}
}